Remove hardcoded kValueSizeBytes values from variable-length header extensions.

webrtc/modules/rtp_rtcp/source/rtp_header_extensions.h

Index: webrtc/modules/rtp_rtcp/source/rtp_header_extensions.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_header_extensions.h b/webrtc/modules/rtp_rtcp/source/rtp_header_extensions.h
index c60f29050d5244fc6ea88d8648c7fd1c9762d56e..2a0ebdc94b8b9927dcd0dcb85a386c35715af655 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_header_extensions.h
+++ b/webrtc/modules/rtp_rtcp/source/rtp_header_extensions.h
@@ -115,9 +115,6 @@ class VideoContentTypeExtension {
 class RtpStreamId {
  public:
   static constexpr RTPExtensionType kId = kRtpExtensionRtpStreamId;
-  // TODO(danilchap): Implement write support of dynamic size extension that
-  // allows to remove the ValueSize constant.
-  static constexpr uint8_t kValueSizeBytes = 1;
   static constexpr const char* kUri =
       "urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id";
 
@@ -128,9 +125,6 @@ class RtpStreamId {
 class RepairedRtpStreamId {
  public:
   static constexpr RTPExtensionType kId = kRtpExtensionRepairedRtpStreamId;
-  // TODO(danilchap): Implement write support of dynamic size extension that
-  // allows to remove the ValueSize constant.
-  static constexpr uint8_t kValueSizeBytes = 1;
   static constexpr const char* kUri =
       "urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id";